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Influence of strain on the thermal behaviour of poly(chlorotrifluoroethylene)
Author(s) -
Ramachandra P,
Ramani R,
Ramgopal G,
Shariff Gani,
Thimmegowda M C,
Sathyanarayana P M,
Ranganathaiah C
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199901)48:1<33::aid-pi98>3.0.co;2-u
Subject(s) - chlorotrifluoroethylene , materials science , glass transition , annealing (glass) , polymer , positron annihilation , composite material , thermal , thermodynamics , positron , copolymer , physics , tetrafluoroethylene , quantum mechanics , electron
The effects of uniaxial drawing on the free volume of poly(chlorotrifluoroethylene) have been investigated using the positron annihilation lifetime technique. Annealing measurements were made both in unstrained and maximum strained conditions of the polymer to understand the influence of residual stress on the thermal behaviour. The results indicate uncoiling of the molecular chains upon stretching accompanied by orientation of the polymeric chains. The results further indicate an increase of the glass transition temperature of the drawn film and a negative thermal expansion beyond the glass transition temperature, supported by an increase in activation energy for the strained polymer. © 1999 Society of Chemical Industry